Getting away with such situations is not always easy. It takes years to heal the wound, if the person is / was sincere to the other. One thing you could do is throw away all the gift stuff of that person & make sure you do not get in contact with him / her again. Even if they try to patch up do not give a chance because if this person can leave u one time, no doubt s/he would do that to you again. If u r doing a job, involve urself fully into that which will give you two benefits,

1. Better performance in job
2. Build your confidence in life again

& slowly with the time passing by, you'll be able to get over this mess.